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Virtual Event | September 15-16, 2021
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Wednesday, September 15 • 13:35 - 14:00
Dirty Quota-Based VM Live Migration Auto-Converge - Manish Mishra & Shivam Kumar, Nutanix India

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The current qemu auto-converge implementation works by throttling all the vcpus based on dirty-rate and network-throughput observed over an iteration. This leads to - all the vcpus getting equally penalized, multiple iterations to get to the optimal throttle value, and convergence failure when >99% throttle is required. This talk proposes a new algorithm based on individual vcpu “dirty quota” that dynamically throttles individual vcpus based on their contribution to overall memory dirtying. It does so by enforcing an upper limit(dirty-quota) on amount of pages a vcpu is allowed to dirty within a small interval of time to limit the total pages dirtied over an iteration. The advantage of this approach is that it penalizes only the write-intensive vcpus, dynamically adapts in case of varying network and dirty-rate and improves convergence by allowing more granular control over dirty rates.

Speakers
avatar for Shivam Kumar

Shivam Kumar

Member of Technical Staff, Nutanix
I work for the AHV team at Nutanix where most of my work to date is around improving live migration algorithms. Other than live migration, my interests lie in statistical analysis, machine learning, operating systems, and virtualization in general.
MM

Manish Mishra

Member of Technical Staff, Nutanix India
Manish Mishra works for the AHV-HOST team in Nutanix with interests in Virtualisation, OS, live migration.



Wednesday September 15, 2021 13:35 - 14:00 UTC
TBA
  KVM Track 1
  • Presentation Slides Attached Yes